Greater London · England
External Mastic in Palmers Green
Specialist external mastic for Palmers Green: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Panel joints letting water in
- Joints with sealant missing in places
- Damp patches traced to an open external joint
Honest limits
Sealant isn’t the answer to every problem, and we’ll tell you before we start. Sealant will not put right:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Cracking across the wall rather than at a joint
- Render that is blown, hollow or coming away
If you’re not sure, just ring 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Brickwork movement joints
- Copings & trims
- Concrete & block
External mastic for homes and businesses in Palmers Green
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two where a rigid filler would soon crack. We are often asked to deal with movement joints filled with mortar instead of sealant and brick movement joints where the sealant has split, on joints between brick and frames, copings & trims and concrete & block.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so a leaking gutter joint or failed wall joint can affect more than one home. In a converted house in Palmers Green, it’s worth checking who is responsible for the outside before booking.
A one-year guarantee comes as standard, so you are not left on your own once the job is done.
- Location
- Palmers Green (N13, N22, N11)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Render joints
Render is weaker at the surface than brick, so a sealant that stretches easily protects the edges. We prime where the product needs it.
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible year round.
Also near Palmers Green
Also in Palmers Green
Palmers Green questions
Can parking be tricky for a visit in Palmers Green?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you help a landlord with a rental near Palmers Green station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or email us and tell us about the property, and we’ll send you a clear quote.
Can you seal over the old sealant?
No. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Do you use backing rod?
Backing rod controls the sealant depth and keeps it off the back of the joint. That way it bonds to the two sides only and can stretch.
Will there be a smell?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
Do you guarantee your work?
Yes. Every job comes with a 12-month guarantee.
Common problems we fix in Palmers Green
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
Signs it’s time to call us include:
- Moss and dirt in joints with no sealant left
- Gaps where render, brick and frames meet
- Leaking joints around cladding and façade panels
- Brick movement joints where the sealant has split
Managing a site like St Anne's Catholic High School for Girls? Then its movement joints, gutters and trims need looking after like any other building’s.
What your quote should include
- Whether VAT is included
- How much experience the applicator has
- How the colour is chosen
- How long the guarantee is
Keeping the joints in good condition
After the cure time, these simple habits help:
- Wash walls gently around the sealant
- Check external joints each spring
- Keep soil, plants and ivy away from the joints
- Keep movement joints as flexible joints, not mortar
Only paint over the joint if we’ve confirmed the sealant can take paint. Many exterior sealants are not designed to be painted, and paint can crack as the joint moves.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
Why deal with it now?
Running new sealant over the old bead rarely lasts. New sealant does not bond well to old, weathered sealant, so the old joint is cut out fully first. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- Colour picked to suit the job
- Sanitary silicone with an anti-fungal additive in wet areas
- Quality sealants from Arbo and Everbuild
Read what affects the cost and customer reviews.
How we quote for external mastic
The price is agreed before any work begins. It takes into account:
- Access and height
- Whether there’s mould to deal with
- Which sealant suits the joint
- The old material and how stubborn it is
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
What to tell us for a quote
You do not need to know the technical terms. Just tell us:
- The problem you’ve noticed
- Whether it’s a home or a business
- The address or postcode of the job
- Whether it has been sealed before
There’s no standard price list, because every job is different. Instead, we send you a clear quote for your job. To get started, ring 0345 464 0079 or drop us an email.
What happens on the day
You do not need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the work takes a few hours for a handful of joints, longer for a whole elevation in most cases. For a job in Palmers Green, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by walking round the building and agreeing the joints and the access.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Clear items away from the joints we’re working on
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
How to get a quote
If you are in Palmers Green and need external mastic, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and you’ll get a clear quote before we start.
Advice
Outside joints around Palmers Green
Historic houses like Bruce Castle (about 1.9 miles south-east) are a reminder that the area around Palmers Green has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts.
Palmers Green is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. In the older streets around Palmers Green United Reformed Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Palmers Green is about 6 miles north of St Pancras, in Greater London. Homes, rented property, offices and hotels in Palmers Green is covered for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. Across Greater London, we cover 764 places, and Palmers Green is one of them. London is on our list too, around 8 miles away.
Work in N13, N22 and N11 works the same way as everywhere else we cover. If you need external mastic at a property on Oak Lane, Fox Lane and York Road or a nearby road, our applicators can take on the job. Being close to the A105 and A1004, Palmers Green is simple for us to get to. Neighbouring places we cover for external mastic include Oakthorpe Park (1 mile south-east), Arnos Grove (1 mile west), Bounds Green (1 mile south-west), Bowes Park (1 mile south) and Southgate (1 mile north-west). Larger places within reach include London (8 miles south), City of Westminster (7 miles south), Marylebone (7 miles south), Kensington (9 miles south-west), St Pancras (6 miles south) and Shoreditch (6 miles south).
What’s near Palmers Green
We work in homes and buildings around St Thomas More Catholic School, Broomfield Park and The Alfred Herring pub, among other places. Palmers Green has its own railway station: Palmers Green station. Well-known places in the area include Broomfield House Museum (within half a mile west) and Greentrees Hospital (0.6 miles south-east). For a walk, there’s Highgate Hill and Darland's Lake.